<style type="text/css">
  /**
  * By default, Storybook has the preview panel set to `overflow: auto`.
  * For whatever reason, this causes two scrollbars to show up for all
  * content. This removes the outer scrollbar.
  */
  .SplitPane > .Pane.Pane1.horizontal {
    overflow: hidden !important;
  }
</style>